Emma the days have long gone since email addresses were posted in newsgroups and forums. For years after I stopped doing it I endured a continual avalanche of spam. I still get some but it is much less than it was.
Important Note: You can share the folder with Everyone if there is no private/sensitive information (such as the screen shot of a prompt error message). To so, simply select the "Everyone (Public)" option in the "Share with" box. Please refer to the following screen shot: